Share-Based Payment - Summary Of Share Based Payment (Detail)	3 Months Ended
Mar. 31, 2024
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Ending balance	1,226,958
Restricted Stock Units [Member]
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Beginning balance	576,625
Granted	694,908
Transferred during the period	(176,317)
Forfeited during the period	(30,929)
Ending balance	1,064,287
Restricted Stock Units [Member] \| 2024
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	37,349
Restricted Stock Units [Member] \| 2025
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	398,411
Restricted Stock Units [Member] \| 2026
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	398,779
Restricted Stock Units [Member] \| 2027
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	229,748
Performance Stock Units [Member]
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Beginning balance	105,023
Granted	92,655
Transferred during the period	(35,007)
Forfeited during the period	0
Ending balance	162,671
Performance Stock Units [Member] \| 2024
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	0
Performance Stock Units [Member] \| 2025
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	65,893
Performance Stock Units [Member] \| 2026
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	65,893
Performance Stock Units [Member] \| 2027
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	30,885
Restricted Stock Units and Performance Stock Unit [Member]
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Beginning balance	681,648
Granted	787,563
Transferred during the period	(211,324)
Forfeited during the period	(30,929)
Ending balance	1,226,958
Restricted Stock Units and Performance Stock Unit [Member] \| 2024
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	37,349
Restricted Stock Units and Performance Stock Unit [Member] \| 2025
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	464,304
Restricted Stock Units and Performance Stock Unit [Member] \| 2026
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	464,672
Restricted Stock Units and Performance Stock Unit [Member] \| 2027
Sharebased Payment Arrangement, Restricted Stock Unit, Activity [Line Items]
Vested at the reporting date	260,633

Number of other equity instruments transferred in share based payment arrangement.

No definition available.

Name:	asnd_NumberOfOtherEquityInstrumentsTransferredInShareBasedPaymentArrangement
Namespace Prefix:	asnd_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

Share-based payment arrangement, restricted stock unit, activity.

+ References

No definition available.

+ Details

Name:	asnd_SharebasedPaymentArrangementRestrictedStockUnitActivityLineItems
Namespace Prefix:	asnd_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) granted in a share-based payment arrangement.

+ References

Reference 1: http://www.xbrl.org/2009/role/commonPracticeRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 45
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_45&doctype=Standard
-URIDate 2023-03-23

Reference 2: http://www.xbrl.org/2003/role/disclosureRef
-Name IFRS
-Number 2
-IssueDate 2023-01-01
-Paragraph 47
-Subparagraph b
-URI https://taxonomy.ifrs.org/xifrs-link?type=IFRS&num=2&code=ifrs-tx-2023-en-r&anchor=para_47_b&doctype=Standard
-URIDate 2023-03-23

+ Details

Name:	ifrs-full_NumberOfInstrumentsOtherEquityInstrumentsGranted
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) exercised or vested in a share-based payment arrangement.

+ References

+ Details

Name:	ifrs-full_NumberOfOtherEquityInstrumentsExercisedOrVestedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) forfeited in a share-based payment arrangement.

+ References

+ Details

Name:	ifrs-full_NumberOfOtherEquityInstrumentsForfeitedInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	duration

- Definition

The number of other equity instruments (ie other than share options) outstanding in a share-based payment arrangement.

+ References

+ Details

Name:	ifrs-full_NumberOfOtherEquityInstrumentsOutstandingInSharebasedPaymentArrangement
Namespace Prefix:	ifrs-full_
Data Type:	xbrli:decimalItemType
Balance Type:	na
Period Type:	instant

- Details

Name:	asnd_ShareBasedPaymentArrangementAwardTypeAxis=asnd_RestrictedStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_VestingOfSharesAxis=asnd_TwoThousandAndTwentyFourMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_VestingOfSharesAxis=asnd_TwoThousandAndTwentyFiveMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_VestingOfSharesAxis=asnd_TwoThousandAndTwentySixMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_VestingOfSharesAxis=asnd_TwoThousandAndTwentySevenMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_ShareBasedPaymentArrangementAwardTypeAxis=asnd_PerformanceStockUnitsMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type:

- Details

Name:	asnd_ShareBasedPaymentArrangementAwardTypeAxis=asnd_RestrictedStockUnitsAndPerformanceStockUnitMember
Namespace Prefix:
Data Type:	na
Balance Type:
Period Type: